Episode 5: Sakurako wants Himawari to give her some answers to her homework. When the latter refuses, the former runs out of the room. Some sounds of a struggle later, Sakurako comes back with Himawari's little sister tucked under her arm, threatening the pinch her cheeks and tickle her. Just when the situation seems like it couldn't get any funnier, in comes a heartwarming, self sacrificing speech from said little sibling, that leaves her captor on her knees, apologizing.
From the same episode, Chitose getting a massive nosebleed after spotting a table of yuridoujinshi while cosplaying as Ganbo at Comuket. The surrounding convention-goers don't know what to make of the big plastic orb making muffled sounds and spewing a stream of blood.
Episode 12: Mirakurun's death scene. "Oh, and finish my math and Japanese homework for me." Also, sex-crazed Chitose.
The opening of S2 manages to achieve a CMOF, with Kyouko dancing like a crazy person and playing Air Guitar with a huge grin next to Yui just swaying her arms with a completely neutral facial expression.
S2-Episode 1: During the ping-pong game a ball lands in one of Chinatsu's pigtails. The hairs wrap around it and consume it as we hear a horrific scream.
Akari's dream. Enough said.
S2-Episode 2: Two words; hand-gargling.
This troper was dying during the student council scene.
S2-Episode 4: When asked about how she was inspired to make experiments, Nana tells them about when she had a pet robotic dog named Choco. One day, he stopped working and that influences her into trying out experiments in order to fix him. She then stated that she lied.
At the end of the episode, everyone is walking home in the rain and Kyoko is walking in front of Akari so both of them can fit entirely under one umbrella, but this also blocks Akari from the viewers' perspective. Then a car drives by and splashes them all with water... except Akari doesn't get wet because she was technically off-screen! Kyoko's thoughts about all this: Akari, you're terrifying!
S2 episode 7: Sakurako suggesting that Himawari removes her boobs to become more powerful.
Later, Sakurako's soulless eyes when she overhears that Himawari's bust has grown again, while her waist hasn't changed.
Akane(Akari's older sister) enjoying some nice tea, classical music, and manga...all with an Akari body pillow next to her, and Akari's panties on her head.